/* SPDX-License-Identifier: GPL-2.0-only */ #include <spi-generic.h> #include <spi_flash.h> #include <console/spi.h> static struct spi_slave slave; void spiconsole_init(void) { spi_init(); spi_setup_slave(0, 0, &slave); } /* * The EM100 'hyper terminal' specification defines a header of 9 characters. * Because of this, devices with a spi_crop_chunk of less than 10 characters * can't be supported by this standard. * * To add support in romstage, the static struct here and the ones used by * spi_xfer will need to be modified - removed, or mapped into cbmem. * * Because the Dediprog software expects strings, not single characters, and * because of the header overhead, this builds up a buffer to send. */ void spiconsole_tx_byte(unsigned char c) { static struct em100_msg msg = { .header.spi_command = EM100_DEDICATED_CMD, .header.em100_command = EM100_UFIFO_CMD, .header.msg_signature = EM100_MSG_SIGNATURE, .header.msg_type = EM100_MSG_ASCII, .header.msg_length = 0 }; /* Verify the spi buffer is big enough to send even a single byte */ if (spi_crop_chunk(&slave, 0, MAX_MSG_LENGTH) < sizeof(struct em100_msg_header) + 1) return; msg.data[msg.header.msg_length] = c; msg.header.msg_length++; /* Send the data on newline or when the max spi length is reached */ if (c == '\n' || (sizeof(struct em100_msg_header) + msg.header.msg_length == spi_crop_chunk(&slave, 0, MAX_MSG_LENGTH))) { spi_xfer(&slave, &msg, sizeof(struct em100_msg_header) + msg.header.msg_length, NULL, 0); msg.header.msg_length = 0; } }